So that we can have a nice zsh completion output:

% git <tab>
add       -- add file contents to the index
bisect    -- find by binary search the change that introduced a bug
branch    -- list, create, or delete branches
checkout  -- checkout a branch or paths to the working tree
clone     -- clone a repository into a new directory
commit    -- record changes to the repository
diff      -- show changes between commits, commit and working tree, etc
fetch     -- download objects and refs from another repository
grep      -- print lines matching a pattern
init      -- create an empty Git repository or reinitialize an existing one
log       -- show commit logs
merge     -- join two or more development histories together
mv        -- move or rename a file, a directory, or a symlink
pull      -- fetch from and merge with another repository or a local branch
push      -- update remote refs along with associated objects
rebase    -- forward-port local commits to the updated upstream head
reset     -- reset current HEAD to the specified state
rm        -- remove files from the working tree and from the index
show      -- show various types of objects
status    -- show the working tree status
tag       -- create, list, delete or verify a tag object signed with GPG

And other niceties, like 'git --git-dir=<tab>' showing only directories.

For the rest, the bash completion stuff is still used.

Also, add my copyright, since this more than a thin wrapper.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 contrib/completion/git-completion.zsh | 120 +++++++++++++++++++++++++++++++++-
 1 file changed, 119 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.zsh 
b/contrib/completion/git-completion.zsh
index 93d8f42..49f0cb8 100644
--- a/contrib/completion/git-completion.zsh
+++ b/contrib/completion/git-completion.zsh
@@ -2,6 +2,8 @@
 
 # zsh completion wrapper for git
 #
+# Copyright (c) 2012-2013 Felipe Contreras <felipe.contre...@gmail.com>
+#
 # You need git's bash completion script installed somewhere, by default on the
 # same directory as this script.
 #
@@ -21,6 +23,9 @@ complete ()
        return 0
 }
 
+zstyle -T ':completion:*:*:git:*' tag-order && \
+       zstyle ':completion:*:*:git:*' tag-order 'common-commands'
+
 zstyle -s ":completion:*:*:git:*" script script
 test -z "$script" && script="$(dirname 
${funcsourcetrace[1]%:*})"/git-completion.bash
 ZSH_VERSION='' . "$script"
@@ -69,6 +74,115 @@ __gitcomp_file ()
        compadd -Q -p "${2-}" -f -- ${=1} && _ret=0
 }
 
+__git_zsh_bash_func ()
+{
+       emulate -L ksh
+
+       local command=$1
+
+       local completion_func="_git_${command//-/_}"
+       declare -f $completion_func >/dev/null && $completion_func && return
+
+       local expansion=$(__git_aliased_command "$command")
+       if [ -n "$expansion" ]; then
+               completion_func="_git_${expansion//-/_}"
+               declare -f $completion_func >/dev/null && $completion_func
+       fi
+}
+
+__git_zsh_cmd_common ()
+{
+       local -a list
+       list=(
+       add:'add file contents to the index'
+       bisect:'find by binary search the change that introduced a bug'
+       branch:'list, create, or delete branches'
+       checkout:'checkout a branch or paths to the working tree'
+       clone:'clone a repository into a new directory'
+       commit:'record changes to the repository'
+       diff:'show changes between commits, commit and working tree, etc'
+       fetch:'download objects and refs from another repository'
+       grep:'print lines matching a pattern'
+       init:'create an empty Git repository or reinitialize an existing one'
+       log:'show commit logs'
+       merge:'join two or more development histories together'
+       mv:'move or rename a file, a directory, or a symlink'
+       pull:'fetch from and merge with another repository or a local branch'
+       push:'update remote refs along with associated objects'
+       rebase:'forward-port local commits to the updated upstream head'
+       reset:'reset current HEAD to the specified state'
+       rm:'remove files from the working tree and from the index'
+       show:'show various types of objects'
+       status:'show the working tree status'
+       tag:'create, list, delete or verify a tag object signed with GPG')
+       _describe -t common-commands 'common commands' list && _ret=0
+}
+
+__git_zsh_cmd_alias ()
+{
+       local -a list
+       list=(${${${(0)"$(git config -z --get-regexp 
'^alias\.')"}#alias.}%$'\n'*})
+       _describe -t alias-commands 'aliases' list $* && _ret=0
+}
+
+__git_zsh_cmd_all ()
+{
+       local -a list
+       emulate ksh -c __git_compute_all_commands
+       list=( ${=__git_all_commands} )
+       _describe -t all-commands 'all commands' list && _ret=0
+}
+
+__git_zsh_main ()
+{
+       local curcontext="$curcontext" state state_descr line
+       typeset -A opt_args
+       local -a orig_words
+
+       orig_words=( ${words[@]} )
+
+       _arguments -C \
+               '(-p --paginate --no-pager)'{-p,--paginate}'[pipe all output 
into ''less'']' \
+               '(-p --paginate)--no-pager[do not pipe git output into a 
pager]' \
+               '--git-dir=-[set the path to the repository]: :_directories' \
+               '--bare[treat the repository as a bare repository]' \
+               '(- :)--version[prints the git suite version]' \
+               '--exec-path=-[path to where your core git programs are 
installed]:: :_directories' \
+               '--html-path[print the path where git''s HTML documentation is 
installed]' \
+               '--info-path[print the path where the Info files are 
installed]' \
+               '--man-path[print the manpath (see `man(1)`) for the man 
pages]' \
+               '--work-tree=-[set the path to the working tree]: 
:_directories' \
+               '--namespace=-[set the git namespace]' \
+               '--no-replace-objects[do not use replacement refs to replace 
git objects]' \
+               '(- :)--help[prints the synopsis and a list of the most 
commonly used commands]: :->arg' \
+               '(-): :->command' \
+               '(-)*:: :->arg' && return
+
+       case $state in
+       (command)
+               _alternative \
+                         'alias-commands:alias:__git_zsh_cmd_alias' \
+                         'common-commands:common:__git_zsh_cmd_common' \
+                         'all-commands:all:__git_zsh_cmd_all' && _ret=0
+               ;;
+       (arg)
+               local command="${words[1]}" __git_dir
+
+               if (( $+opt_args[--bare] )); then
+                       __git_dir='.'
+               else
+                       __git_dir=${opt_args[--git-dir]}
+               fi
+
+               (( $+opt_args[--help] )) && command='help'
+
+               words=( ${orig_words[@]} )
+
+               __git_zsh_bash_func $command
+               ;;
+       esac
+}
+
 _git ()
 {
        local _ret=1
@@ -78,7 +192,11 @@ _git ()
        prev=${words[CURRENT-1]}
        let cword=CURRENT-1
 
-       emulate ksh -c __${service}_main
+       if (( $+functions[__${service}_zsh_main] )); then
+               __${service}_zsh_main
+       else
+               emulate ksh -c __${service}_main
+       fi
 
        let _ret && _default -S '' && _ret=0
        return _ret
-- 
1.8.2.1.1031.g2ee5873

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